/* ============================================================
   02-base.css — reset, elementi nativi, utility, accessibilità.
   ============================================================ */

*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 5rem;
}

body {
  margin: 0;
  background: var(--carta);
  color: var(--inchiostro);
  font-family: var(--f-titoli);
  font-size: var(--t-corpo);
  line-height: 1.65;
  overflow-x: clip;
  -webkit-font-smoothing: antialiased;
}

/* carta millimetrata: la tavola tecnica su cui "appoggia" tutto */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    linear-gradient(var(--linea) 1px, transparent 1px),
    linear-gradient(90deg, var(--linea) 1px, transparent 1px);
  background-size: 96px 96px;
  opacity: 0.35;
  mask-image: radial-gradient(ellipse at 60% 40%, #000 20%, transparent 75%);
}

h1, h2, h3, p, ol, ul, dl, dd, figure, blockquote { margin: 0; }
ul[class], ol[class] { list-style: none; padding: 0; }
h1, h2, h3 { font-weight: 500; line-height: 1.08; letter-spacing: -0.035em; text-wrap: balance; }
p { text-wrap: pretty; }
img, svg, canvas { display: block; max-width: 100%; }
a { color: inherit; }
button, input, textarea { font: inherit; color: inherit; }

:focus-visible {
  outline: 2px solid var(--blu-vivo);
  outline-offset: 3px;
  border-radius: 2px;
}

::selection { background: var(--ambra); color: var(--inchiostro); }

/* ------------------------------------------------ utility */
.u-contenitore {
  width: 100%;
  max-width: var(--largh-max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.u-etichetta {
  font-family: var(--f-mono);
  font-size: var(--t-etichetta);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--inchiostro-tenue);
}

.u-solo-lettori {
  position: absolute !important;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

.salta {
  position: absolute;
  left: var(--spazio-4);
  top: -4rem;
  z-index: 100;
  padding: var(--spazio-3) var(--spazio-4);
  background: var(--inchiostro);
  color: var(--carta);
  border-radius: var(--raggio-s);
}
.salta:focus { top: var(--spazio-4); }

/* ------------------------------------------------ comparse
   Solo se JS c'è (classe .js su <html>): senza JS è tutto visibile. */
.js .rivela {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity var(--tempo-lento) var(--curva), transform var(--tempo-lento) var(--curva);
  transition-delay: var(--ritardo, 0s);
}
.js .rivela.is-visibile { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  .js .rivela { opacity: 1; transform: none; }
}